1.1 --- a/lemon/dfs.h	Wed Jan 11 14:01:21 2012 +0100
     1.2 +++ b/lemon/dfs.h	Fri Jan 20 19:20:02 2012 +0100
     1.3 @@ -1193,6 +1193,7 @@
     1.4          visitor.backtrack(arc);
     1.5        }
     1.6        _Visitor& visitor;
     1.7 +      Constraints() {}
     1.8      };
     1.9    };
    1.10  #endif